Actually what would be needed is just a major triad with a sharp 4th (1,3,#4,5) where the most common voicing would be (from low to high): 5,1,3,#4
and WITHOUT the 7th (this chord with minor 7th is already available in iReal.
With this basic chord (1,3,#4,5), many other chords can be built from there using slash chords, so it's a great idea to add it.